2.时态：to do 表将来 / to be doing 表进行 / to have done 表过去
3.to do 与 doing 的区别
1）to do 表一次性，具体性的动作； doing 表经常性，习惯性的动作
A. like/love/hate/dislike + doing / + to do
B.to do / doing 做主语时，若一次性，具体性的动作，用to do; 若经常性，习惯性的动作，则用doing
2）to do 表将来的事； doing 表做过的事
remember to do / remember doing
forget to do / forget doing
regret to do / regret doing
try to do / try doing
go on to do / go on doing
stop to do / stop doing
mean to do / mean doing
can't help to do / can't help doing
3)作宾语
avoid/admit/advise/suggest/consider(考虑）/delay/forbid/allow/permit/magine(想象)/mind/practise/resist/risk + doing
expect/intend(打算）/demand/agree/promise/refuse/determine(决定）/offer/manage/heasitate(犹豫）
+ to do
4.不定式主动表被动
1）be + 表性质的形容词 + to do
The water is safe to drink.
2) 不定式动作的逻辑主语在句子中出现
I have some clothes to wash,so I can't to play football.
3)wh- + to do
5.形式主语/形式宾语 it
It + be + adj. + for sb / of sb + to do
It is difficult to breathe and the dust makes me ill.
The thick dust makes it difficult to see.----- it 形式宾语 、 to see 真正的宾语
Berners Lee made it possible for everyone to use the Internet.
6.不带to的不定式
1）三个使役动词 make / let / have
make sb do --- be made to do
2)感官动词 see/ watch / notice /hear /feel /listen to
see sb do / notice sb do ... ------ 全过程
see sb doing / notice sb doing ... ----- 正在做
3）would rather do
4)but/except + to do
若句子谓语动词为 do / did / does, but /except + do
5)can't but do /can't help but do / can't help doing
7.特殊
1）need/want/require/deserve + doing 主动表被动 ==== +to be done
2) 不定式做定语
名词前有序数词或 the last,the next,the only,the very 修饰时，常用不定式做定语
He is always the first one to come and the last one to leave.
The next train to arrive is from Beijing.
She is the only woman to have been elected to such a post.
China became the third country to send a man into space.
3)be too +adj.+for sb +to do sth 太。。。而不能。。。
The problem is too difficult for us to solve.
特殊：当too 后面的形容词表示某种心情时，表肯定。
He was too anxious to leave. 他急于离开。
4）too...to 和否定副词not,never连用表示肯定
It is never too late to learn.
链接：You can't be too careful. 你再仔细也不为过。（越仔细越好）
too 和否定副词 not ,never 连用--- 表示再。。。也不为过 / 越。。。越好
5）不定式跟在表示某种心情（高兴，生气，荣耀，遗憾）等形容词后，说明产生这种情感的原因。
I am pleased to be invited to talk here.
6)so...as to do 如此。。。以至于。。。
You were so stupid as to leave your car unlocked.
7)adj./adv. + enough to do 足够做。。。
You are old enough to decide by yourself.
8)to tell the truth / to be honest 独立成分
